Adding and subtracting machine.



H. A. BROWN & B, B. BURKS. ADDING AND SUBTRACTING MACHINE.

- I APPLICATION FILED OCT 8, 1908. 926,1 66.

//y 14. Brow/7g Patented June 29, 1909,.

A lgz/ athunu;

A BROWN & B. B. BURKS. ADDING AND SUBTRAGTING MACHINE.

APPLICATION FILED OCT. 8, 1908.

SHEET 2.

a tented June 2 SHEETS- (J1me 14 to a? Henry 4. Bron r7 java? 3' Burks.

HENQY A. BROWN, OF ABNEY, AND BEVELY B. BURKS, OF HIS TON, VlRGll-Zik.

ADDING AND SUBTRACTENG MAG-EH13.

To, SN'SJSS. Specification of Lettens Patent. Eatenscd June 29, 1f: 3.

Application filed fic'icber 8, 19-38. Serial No. sewer.

all whom it may 00 they insiy be mounted or seated in any o bher 7 1t i c, HFYRY Bnown. a suitable manner.

citzis, residing a Ahi'lcn 'clly in the upper space 2 is secured 5 Raleigh and State of the a said axis passing through a hub QC cured to and extending from this hub I i nhn'zzli y of radial arms carrying at. 60 their outer ends a ring 7, said ring being 'Ili' me. have invented certa n new pr 'vided with a. series (preferably three) of Improvements in Adding and on him: ring 8 forming grooves 921ml 10.

ng liiachines, of whicl'i th. follow; 'l groov s are provided with teeth 11 ciiicat-ion reference being had and 12 res ectively extending entirely 65 E ates, residing rntv or Sun iners and St? e so; iponying dr'aw round thei circumference, said teeth being iiGS to computing HIS-- adapted to act conjunction with pointers view ccrtoin novel 13, i i and T5 hereinafter described. Seenents, whereby i cured bet 5' and :1 c liar 15 are 7* he n'till at their outer ends F8 or he er and a lower axis. a s}; ices hie and stctioi ishs four of on said es, Sulii disks from rcro 21' provided with graductions preferably *5, means cooperating hci prothe axis 4L and the upper and lower sors of th ri 7 and indicsh'iis movable mount d o rings and disks. the rin 18, a i.

of the "present invention is to posed between y nos and easy method of adding his spring ucis l;

o. subtracting any numbers i'rom 1 to the. Cells? 16 and C3 20,600 in a. rapid and accurate manner. ease, and at. the some cure .the machine "hown is adapted for ikjo in hi h ii; b t i the zlfif ng and subtracting of mimhers from egg f ding or Sui, acting. liniiu l to 20,000 is of course understood that 21 and are carried by tlie disk 1 slight inodificctions ii may be mode 9. groove 23, andhaving le ible for handling numbers of greater dethe grooves a d E11 1 nosninaiions. are adapted to 'opemfie in his groove and With these and other objects in view-the act in conjunction with the inner row i: *ention consists of the Glow g novel numbers on the ring 18. The indicators 13, 602" Din -ions nd arrangements of par s 14, 25 and 26 are so constructed to be held, hereinafter more fully described, illustrated, ally i engagement with their rcspecand claimed. tive rings, but upon pressing the button, In the drawings: Figure l is a plan View carried byeach indicator, they are released of a computing machine embodying our inand free to be moved to any position around 45 VBZltlOD. Fig. 2 is a longitudinal sectional the grooves, but, upon removing the finger,

flow through the upper portion of the some. are immediately locked in position. Fig. 3 is a similar View through the lower In i is shown one means which may tioin-and Fig. i is a detail View showing be employed for locking the indicators in 188,113 which may be employed to operate position andzas all 01 said indicators hereto- 5c the indicators. fore mentioned 1nay be constructed alike, a

In carrying out oiir invention we may eindescription and detailed illustration one 5'65 ploy a base 1 cut away in the manner shown will suflice for 3 11. in the figure mentioned at 2 and 3, to provide space in which to seat above a pointer 25, 18 shown carried by a the disks, but it is, of course, understood that base 27 of such shape as to move freely Witl1- in the groove 23, while at the same time bcing prevented from changing its position reiative to the ring 185 This base carries a shank 28 of a button 29 and is cut away to receive said shank and one end of a slotted lever 30 pivoted therein. The opposite end of the lever 30 engages with the teeth 2 and by reference to the drawings it will be seen that by pressing upon the button 29 the indicator is released from the-teeth and .iree to move, while releasing the button will lo k the indicator. 'Mounted so as to revolve freely upon the axis 4 .is a weighted pointer or indicator 31 having, near itsout-er end, ears, between which is pivoted a spring pressed L-shaped lever 32 having one end ro'ectim throu h said indicator and ear 'a hub 4:1 similar to the hub .5.

gaging teeth 33 securedto the ring 22 of the disk 19. Thispointer is normally tree to move over the disk 19, but when the bu con. 32 of said pointcris pressed downward, the lever 32 engages the teeth causing the disl: 19 to rotate therewith.

Pivotally mounted at in the ring 18, which is preferably hollow, is a segment which carries two oppositely disposed pivoted arms 36 adapted to engage teeth 37 carried by the inner ring 8 of the dis; '4'. The segment 35 also carries an upstanding I pin 38 which is in the path of inovei'nent the indicator 25 or 26, so that when either of said indicators pass the 100 mark they will swing the segment to one side and canse the arms to move the ring 7 to the right or left one tooth, as the case may be.

Another axis i0 is secured centrally or" the cut out portion 3 of the base 1, and c upon this hub -11 by means of arms ring d3 having upon 1ts upper surface graduatiens and numbers from Zero to 29,080.,

and ha ving on its outer periphery, teeth i t-' engaging a pinion 45 mounted in the base i. This-pinion 1S operated by a pin 46 carriec.

by the indicator 1%, said pin 'tlhing the pinion in passing and moving the ring one graduation. An inner disk 4E7 revolves around the axis 40 and has a groove 48 and vindicators do and hi similar to those already described, while a pointer or indi cater 56 similar to the pointer or indicator 31 also mounted on said'axis. It will l readily seen that by the mounting and construction of the pointers or indicators and'5o v that upon being relea. iim'i'iediately ssuine a position point ere:

The 1 which operates is held released. from e store 4 ed to its original posi is brong'ht back by means of a 1 spring 15 secured in said groove if it; is desired to adt the numbers 5, 1t}

' and 50, but nstead of lot by a the button of the indicator again and brinesaid indicator opposite numeral 10, thereoy advancu'ig indicator to names Release said indicator 31 once more and allow it to return to Zero. Again press butso ton of indicator 3]. and more until opposite numeral when indicator 25 will point to the numeral 40, that being the sum oi the t e lull'l crs given. Additions may be in t way until 100 is reached when so .icator 2 strikes pin of; segment and motes ring; 7' one point to the right; At the SzJiQ time a subtraction can is taking piece, heater 26 having been preyionsly posits 100 on disk 18, and if the so no hers are desired to be subtracted from 100, by inoting indicator to numeral 5, re-

g and allowing it to return to zero. men loo and moving to numeral 1'3 and and all return. the' button and move to movements vouid pas iroin to 05. from 95 to 85 and t. toto 50, the difference.

' t 1 5, A and 15 be operated manner indicators '25, 2G 11%. corresponding to 25 and may he used in the same manner as in this event the outer row of mnnerals on .he ring 18 may be treated 21st. 1 If),

lnindreds, Soy making the 1 amounts.

Ag ip t produced r. .ui uting ma?) line ate niechanisn the form.

minor -101 s irime compris th graduati 1. i L s "-0 onions tron]. ZQiQ LU 1.1m said ring and n i '1 ,1 amen one \/i '1 a e tee. to sing: 1th one or 1 i! ("5' norm? ly ned sides 0" 1e in rotatable indi zero mark and vLLl/ easaee 2. A computing machine comprising a ro-- 'tatable ring provided with graduations read; ing in opposite directions from Zero to one hundred, the outer edge of said" ring being provided with teeth, a second rotatable ring below the first mentioned ring and also provided with a toothed outer edge, a pinion in mesh with the teeth of the lower ring, a disk mounted within each of said rings and provided with grooves having toothed edges, indicators mounted in each grooveand adapted to engage with the-toothed edges thereof, a rotatable indicator for each disk and also adapted to have a detachable engagement with the teeth in one of said grooves, and a second set of indicators carried by the upper rotatable ring one of which is adapted to contact with said pinion to impart a movement to the lower rotatable ring.

3. A computing machine comprising two rotatable rings held in spaced relation, one

of said ringsbeing provided with a toothed outer edge, a pinion in mesh with said toothed edge, a disk within each ring and provided with rooves having toothededges; adding and su tracting indicators mounted in the grooves of each disk and adapted to engage with the toothed edges thereof, an indicator rotatable over each disk and adapted to engagewith the teeth of one of the edges thereof, and indicators carried by one of the rings, one of said indicators being adapted to contact with said pinion to cause it to impart a movement to the ring with which it is in mesh.

4. A computing machine comprising a base, rotatable rings mounted thereon, disks within said rings, said disks being provided with grooves having toothed edges, indicators movable over said disks, and a sprin pressed lever carried b said disks an adapted to engage with His toothed edges of the grooves to hold said indicators in engagement therewith. p

5. A computing machine comprising a base, rotatable rings mounted thereon, disks within said rings, said disks bein provided with grooves having toothed e ges, indicators movable over said disks, and a locking lever carried by each indicator and adapted to hold the samein engagement with the teothed edges of saidgrooves.

6. A computing 'machine comprising a base, rotatablerings mounted thereon, a disk within each ring and provided with annular grooves having toothed edges, indicators movable over said disks, a locking lever carried by each indicator and having a button whereby the same may be placed in engagementwith the toothed edges of the grooves and a springfor normally holding said levers out of engagement with sai edges.

7. A computing machine comprising a base having openings therein, a ring rotatably mounted in each opening, one of said rings being provided with a toothed outer edge, a pinion in mesh with said toothed edge, a grooved disk within each of said rings, and having teeth formed in each groove, indicators movable over said disks andadapted' to have a locking engagement with thetoothed edges of the'grooves, and a projection carried by one of said indicators and adapted to contact with the said pinion "to impart a movement to the rings with which it isin mesh.

8. A computing machine comprising a rotatable ring and a disk, indicators movable over said disk and cotiperatin with the rotatable ring for adding or su tracting numerals between zero and one hundred, a

second rotatable ring adjacent to the first 

